On my 01 i used the light blue wire with a red trace that was connected to my dimmer switch. I would take off your light panel and test to see which wire will get power and them dim when its turned up/down. Tap into that wire. I don't know if your colors will be the same on an OBS. Here is the link i used from diesel manor.

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i used the dimmer wire on the radio. If you have an aftermatker radio installed it doesnt use need that wire since mst have a constant light.. ill check what color it is for you tommorow, or pull out your radio and see if you can determin it by holding a multi meter to each wire

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